BECKHOFF BC7300 - Manual (Page 3)

Table of contents
BC7300 3
Table of contents
1. Foreword 5
Notes on the documentation 5
Liability Conditions 5
Delivery conditions 5
Copyright 5
Safety Instructions 6
State at Delivery 6
Description of safety symbols 6
2. Basic Principles 7
Device Description of the BC7300 7
The Beckhoff Bus Terminal System 7
The interfaces 9
Electrical power supply 9
Power contacts feeding points 9
Power contacts 9
Fieldbus connection 9
Configuration and programming interface 10
KS2000 Software 10
TwinCAT BC 10
K-Bus Contacts 10
Electrical isolation 10
Operating Modes of the Bus Terminal Controller 11
Mechanical structure 11
Technical data 14
Peripheral Data in the Process Image 15
Start-up procedure and Diagnostics 16
Fieldbus errors 18
3. MODBUS 19
Basic Principles 19
Bus Topology 19
Process Data and Memory Map 20
MODBUS Process Image 22
BC7300 Process Image 22
Assignment of the Bus Terminals 23
Setting and Parameterisation of the MODBUS 24
Parameterisation Table 25
The MODBUS Protocol 26
ASCII 26
RTU 26
Functions 27
Read Digital Outputs (Function 1) 27
Read Digital Inputs (Function 2) 28
Read Analog In/Outputs (Function 3) 28
Read Analog Inputs (Function 4) 29
Writing a Digital Output (Function 5) 30
Writing an Analog Output (Function 6) 30
Writing a Number of Digital Outputs (Function 15) 31
Writing a Number of Analog Outputs (Function 16) 32
Writing and Reading Analog Outputs and Inputs 33
(Function 23) 33
Echoes a query (Sub-Function 0) 35
Bus Coupler Reset (Sub-Function 1) 35
Delete All Counter Contents (Sub-Function 10) 35
Bus Communication Error Counter (Sub-Function 11) 35
Error Answer Counter (Sub-Function 13) 35
Slave Answers (Sub-Function 14) 36